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CAIE A-Level Chemistry 11.2.2 Reactions of Halogens with Hydrogen

Practise describing halogen reactions with hydrogen and comparing how readily chlorine, bromine and iodine react.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • write H2 + X2 → 2HX and use the correct hydrogen halide formula for the chosen halogen
  • describe disappearance of the halogen colour, such as green chlorine or purple iodine vapour
  • compare reaction vigour down the group without confusing it with hydrogen-halide stability

11.2.2—Reactions of the elements with hydrogen question 1

[Maximum number: 1]

The Group 17 elements are oxidising agents.

A student heats equal amounts of I2( g)\mathrm{I}_{2}(\mathrm{~g}) and H2( g)\mathrm{H}_{2}(\mathrm{~g}) in a sealed flask. The student leaves the contents to cool.

State what you would observe during the reaction.

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